Yet another hat-tip to Ridley Scott. In short its about robots. But in the long - its really about human nature + the way that we lose our humanity to the promise of the future. This is quite possibly the greatest Sci Fi movie ever made. Scott has created a future that is bleak, gritty + not as highly evolved as one may have hoped for. A perfect reflection of the people who inhabit it. And in the end, we are asked some tough raison d'etre questions + made to wonder 'What is human?'.